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Cretaceous-era bird tracks: Proof of 100-million-year-old flight?

By The Christian Science Monitor
Tuesday, October 29, 2013 9:26 EDT
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Dinosaur-era bird tracks: Proof of 100-million-year-old flight? (via The Christian Science Monitor)

Photograph (l.) and interpretive drawing (r.) of the four-toed footprint and the groove behind it. The diagram numbers each toe from I (hallux) to IV, outlines the overall form, and shows the main direction of movement as the bird landed (big arrow).…

 
 
 
 
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